Multiple station forging machine with work transfer means



Oct. 3, 1961 s. CERUTTI 3,00

MULTIPLE STATION FQRGING MACHINE WITH WORK TRANSFER MEANS Filed Dec. 29, 1959 4 Sheets-Sheet l Oct. 3, 1961 G. CERUTTI 3,002,204

MULTIPLE STATION FORGING MACHINE WITH WORK TRANSFER MEANS Filed Dec. 29, 1959 4 Sheets-Sheet 2 Oct. 3, 1961 G. CERUTTI 3,002,204

MULTIPLE STATION FORGING MACHINE WITH WORK TRANSFER MEANS Filed Dec. 29, 1959'- 4 Sheets-Sheet 5 Fig. 5

G. CERUTTl Oct. 3, 1961 MULTIPLE STATION FORGING MACHINE WITH WORK TRANSFER MEANS 4 Sheets-Sheet 4 Filed Dec. 29, 1959 site States This invention relates to anautomatic machine for cold pressing of bolts, of the type in which successive operations are carried out on working stations spaced in one horizontal plane.

The main characteristic feature of this invention resides in the fact thatit is equipped with pincers moving synchronously with the machine, adapted to feed the workpieces in a transverse direction to the consecutive working stations, each of said pincers comprising a lower V-shaped member, and a top self-adjusting pressure member which maintains the workpiece under the action of spring means in contact with the lower member.

A further characteristic feature of the machine according to this invention resides in the fact that it provided with a swing plate moving synchronously with the ma chine, arranged beneath the bolt shaping region and adapted to introduce the work pieces into their shaping dies during pressuring of short bolts.

Further characteristic features of this invention will be understood from the appended detailed description referring to the accompanying drawings which show a construction thereof by way'of example. In these drawings:

FIGURE 1 is a plan view of the machine;

FIGURES 2 and 3 show the left side and the right side respectively, of the machine, in elevational views;

FIGURES 4 and 5 are sectional views on lines IV-IV and VV of FIGURE 1;

FIGURE 6 is a cross sectional view similar to FIG- URE 5, during a further working step;

FIGURE 7 is a diagram showing the shapes taken by the work-piece during the various working steps, and

FIGURE 8 is a diagram showing the movement of the feed pincers for the work piece at the successive stations.

1 denotes a driving pulley, driving through a pneumatic or other friction clutch 2 a cross shaft 3 arranged at the rear end of the machine. The shaft 3 drives through a reducing gear 45, a main crank shaft 6-, the intermediate portion of which is engaged by a connecting rod 7 imparting a reciprocating longitudinal motion to a slide 8 carrying at the front a plurality of punches denoted by 9a, 9b, 9c and 9d, cor-responding in number and shape to the successive operations to be carried out for pressing the bolt. The punches 9a-9d are adjustable in a manner known per se in the three planes for accurate alignment and proper spacing with respect to the associated dies 10a, 10b, 10c, 10d, carried by a block 11 adjustably secured to the forward machine portion.

Both the punches and dies can be removed and changed in order to suit the special working requirements and for sharpening purposes.

The material in the form of round iron T is longitudinally fed to the forward machine portion over a number of rollers 12 adapted to straighten the iron and over a pair of grooved rolls 13 which feed the material. The rolls are splined to cross shafts 14, the movement of which is synchronized by a pair of toothed wheels 15. One shaft 14 receives movement over a crank gear 16 and a connecting rod 17 arranged on the left side of the machine and splined through a conventional eccentric to the end of the main crank shaft 6.

The round iron T is fed through a guide hole bored in the block 11 and is intermittently cut to length by a cutter 19 carried by a slide 20 performing a transverse movement guided on the right side of the machine. The

transverse slide 20 is provided with a lower roller 18 engaged by a shaped groove 21 cut in a longitudinal slide 22 receiving motion from a connecting rod 23 articulated to a toothed wheel 24 splined to the crank shaft 6. The point of articulation of the connecting rod 23 to the wheel 24- is conveniently adjustable through slits 25 for the purpose of a correct phase adjustment of the machine.

A vertically movable carriage 26 driven by an arm 27 keyed to a cross shaft 28 is guided beneath the block 1:1 carrying the shaping dies. The shaft 28, FIGURE 3, receives motion through a drive including an arm 29, rod 30, beam 31 swinging about a pivot 32 and a lever 33 having a fork-shaped end 34 guided on a shoe 35 mounted about the end of a shaft 36 carrying a toothed wheel 37 receiving motion from the toothed wheel 24 on the shaft 6.

A shaped groove 38 is cut in the side wall of the toothed gear 37 and engages a roller 39 carried by the lever 33. Engagement of the roller 33 by the shaped groove moves according to a predetermined law the lever 33 and leverage 29, 30, 31 in order to swing the shaft 28 and reciprocate in a vertical direction the carriage 26 synchronously with the machine operation.

A horizontal prismatic guide 26a is formed at the top of the vertically movable carriage 26 and has a transverse carriage 40 movable thereon, the carriage 40 being arranged substantially in the front plane of the dies 10 and carrying at the top a resiliently yieldable projection 41 adapted to cooperate with the cutter 19 cutting the round iron T as well as three V-shaped projections 42a, 42b and 420 serving as the lower members of a corresponding number of pincers adapted to feed the work pieces to the consecutive working stations.

The cross carriage 40 is driven by the cross slide 20 to which the former is connected by means of a lever 44 provided with cylindrical articulations 43, 45 on the cross carriage and cross slide, respectively.

A support 46 is provided on the top of the cross slide 20 and carries a pivot 47 having pivoted thereon an arm 48 biassed by a spring 50 urging it to its lowered position. A vertical push member 49 is moreover arranged between the arm 48 and lever 44 and is guided in a seating in the cross slide 20 for the purpose of moving upwardly the arm 48 against the action of the spring 50 when the cross carriage 40 is lowered by its being connected with the vertically movable carriage 26.

The arm 48 carries a pivot 51 having a beam 52 pivoted thereon, a flat end of which is adapted to cooperate with the projection 420 to form the third pincers feeding the work pieces from the die to the die 10d. The opposite end of the beam 52 carries a pivot 53 having a beam 54 pivoted thereon, both ends of which are flattened and are adapted to cooperate with the V-shaped projections 42a, 42b, respectively, to form the first and second pincers for feeding the work pieces from the die 10a to the die 10b and from the die 10b to the die 100, respectively.

A swing plate 55 is mounted on the cross carriage 40 and has its top end shaped to form projections 55a, 55b, 55c, 55d adapted to introduce the work pieces into their dies during manufacture of short bolts.

Oscillation of the plate 55 for introducing the work pieces is controlled by an arm 56 splined to an arm 57 which is intermittently swung by an adjustable screw 58 carried by the longitudinal slide 22. The screw 58 acts on an arm 59 splined to the end of the arm 57.

Referring to the diagram shown in FIGURE 7, the work piece is initially cut to length by the cutter 19 and is moved to the die 10a in which the punch 9a forms an initial bulge A at the head portion. The work piece is subsequently fed to the second station to the die 10b where the punch 9b forms a further bulge B at the head portion and reduces the diameter on the shank portion C in which the screw thread is to be cut.

At the third station the work piece fitted into the die 100 has the head bulge D completed thereon to a cylindrical bevelled shape, the punch 9b at the first station cutting the head E to a prismatic such as a hexagonal shape while the work piece is in the die 10d.

Movement of the work pieces to the consecutive working stations is efiected by the pincers comprising lower V-shaped members 42a, 42b, 42c and top fiat pressure members 52 and 54.

In order to feed the work pieces, the carriage 26 performs an upward movement while the cross carriage 40 is situated with the lower members 42 of the pincers at the first three stations.

At the same time, the arm 48 is swung downward by the spring 59, the push member 49 resting by its lower end on the lever 44. The lower V-shaped members 42a, 42b, 42c come into contact with the work pieces at the first, second and third station, the top pressure members 54 and 52 bearing at the same time on the work pieces holding them in contact with the V-shaped members by the action of the spring 5%. he pressure members 54, 52 are articulated to each other and are therefore selfadjustable to simultaneously lock all the work pieces.

At this stage the cross slide fast with the cross carriage and arm 44 is moved transversely over a width matching the spacing of the various stations, whereby the work pieces are moved to the consecutive stations, namely the second, third and fourth stations. At

the same time the cutter 19 has cut a length of round iron T which has been caught between the cutter and abutment .41 which feed it to the first station.

The vertically movable carriage 26 and cross carriage 40 are now lowered, the carriage 40 performing a cross back stroke to return the lower V-shaped members 4-2 of the pincers to their initial inoperative position. At the same time as a result of oscillation of the lever 44 and consequent upward movement of the push member 4 9, the arm 43 is moved back upwardly against the action of the spring 50, thereby lifting the pressure members 54, 52 to their initial inoperative position.

Summarizing, the lower and top members of the pincers, FIGURE 8, perform on each cycle a triangular movement including a first approach movement towards the work piece, a subsequent horizontal traverse and a final back stroke in an oblique direction to their initial position.

Synchronism of the movements of the pincers with the operational cycle of the machine can be adjusted by suitable phase adjustment of the articulation of the connecting rod 23 with respect to the roll 24.

What I claim is:

1. In a bolt pressing machine comprising a row of four adjacent successive working stations extending transversely of the machine, each station including a die and cooperating punch axially aligned therebetween, a frame, a slide mounting for reciprocation in a longitudinal direction of said frame, a block adjustably mounted on the machine frame in front of one end of said slide spaced from the latter, said dies being carried by said block and said punches being carried by said slide and arranged in a common plane, a main driving shaft rotatably mounted in said frame transversely thereof, a crank on said shaft, a connecting rod between said crank and said slide for reciprocating the latter, a first carriage slidable in vertical guides provided on the frame beneath said block carrying the dies, a second carriage slidable in horizontal guides provided on said first carriage, three 4 upper-shaped projections on said second carriage, said projections extending upwardly and being arranged at the same level and laterally spaced therebetween by an extent equal to the spacing between the dies, means for transmitting motion from said driving shaft to said first and second carriage, the means for moving said second carriage comprising a longitudinally extending lateral slide arranged at one side of the frame having a longitudinal shaped groove cut at its upper face, an auxiliary cross slide mounted for reciprocation in a transverse guide cut in said lateral slide, a roller rotatable about a vertical aids engaging said shaped groove fast with said auxiliary slide, whereby the latter is reciprocated in said transverse guide on said lateral slide upon reciprocation of the latter, a connecting rod pivoted to said lateral slide, and a crank rotated by a shaft driven from said main driving shaft having the other end of said connecting rod pivoted thereto, a pivot parallel with said dies and punches on the top of said cross slide, an arm hinged by one end to said pivot arranged above the plane in which said dies and said punches are situated, a first beam hinged to said arm intermediate its ends, a second beam hinged to one end of said first beam, said beams being oscillatable, in the same plane as said arm, the ends of said second beam and the other end of said first beam being flattened, a spring acting on the free end of said arm urging it downwardly, a push member mounted slidably in a vertical guide bored in said cross slide abutting said arm by its upper end, a lever hinged at a point intermediate its ends to said cross slide abutting by its one end the lower end of said push member, the other end of said lever being pivoted to said second carriage provided with said upper V-shaped projections, thereby connecting said cross slide and said second carriage and urging said arm upwardly upon displacement of said first carriage downwardly and vice-versa, the parts being so arranged that the flattened ends of said first and second beam are constantly arranged above said V-shaped projections and form with the latter a pincer unit capable of catching the bolts being made and transferring them from one station to the next station, means receviing motion from said main driving shaft being also provided for reciprocating said first carriage. 2. A bolt pressing machine as set forth in claim 1, further comprising a plate mounted for rocking about a horizontal axis arranged parallel with said first and second carriage in front of said block carrying the dies, carried by said second carriage, said plate having four projections at its top edge, said projections being so arranged as to be in front of the dies when said first and second carriages are in positions at which said Vshaped projections on said second carriage are situated just below the last three dies towards the machine side opposite the one carrying said lateral slide, means being provided for oscillating said plate towards said dies when its projections reach a position in front of said dies, said means comprising a cross shaft rotatably mounted in the machine frame, an upstanding arm on said shaft arranged in front of said plate, a second upstanding arm at the end of said shaft protruding from the machine side at which said lateral slide is carried, and an adjustable abutment carried by said lateral slide for acting upon said second upstanding arm when the lateral slide is displaced towards the end of the machine at which said block carrying the dies is arranged.

References Cited in the file of this patent UNITED STATES PATENTS 2,736,909 Hatebur Mar. 6, 1956 

